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LED28-L Rev. A1

Description

LED28-L contain one LED chip die with a typical peak wavelength of 2.84 µm. Due to the special glass covering an increased output power (up to 3-5 times) of typ. 300 µW QCW can be reached.

Maximum Ratings

Parameter Symbol Values

Min. Max. Unit

Operating Current, QCW mode IQCW max 200 mA

Operating Current, pulsed mode IPULSE max 1 A

Storage Temperature ISTR 0 +50 °C

Operating Temperature TCASE 0 +50 °C

Lead Solder Temperature * TSLD +180 °C

* must be completed within 3 seconds, 3 mm from case

LED Characteristics (TCASE=25°C)

* Repetition rate: 0.5 kHz, pulse duration: 1 ms, duty cycle: 50%, current: 200 mA *² Repetition rate: 0.5 kHz, pulse duration: 20 µs, duty cycle: 1%, current: 1 A

Packages

All parameters refer to LEDs in TO18 package with a cavity and operation at ambient temperature 25°C unless otherwise stated.

Parameter Symbol Conditions Values

Min. Typ. Max. Unit

Peak Wavelength λP IF=150mA QCW 2.83 2.90 µm

Half Width (FWHM) ∆λ IF=150mA QCW 300 500 nm

Optical Output Power, QCW * PO QCW mode * 100 300 µW

Optical Output Power, pulsed *² PO Pulse mode *² 700 2000 µW

Operating Voltage VOP IF=200mA QCW 0.2 1.0 V

Switching Time ts ns

Part Number Package

LED28-L TO-18 with glass cover

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Performance Characteristics

Radiant Characteristics (Far-Field Pattern)

Typ. Spectrum (QCW)

Inte

ns

ity [

a.u

.]

Wavelength [nm]

Typ. Optical Power Characteristics (QCW) Typ. Current – Voltage Characteristics (QCW)

Ou

tpu

t P

ow

er

[mW

]

Cu

rren

t [m

A]

Forward Current [mA] Forward Voltage [mV]

TO-18 Package With Glass Cover

Rela

tive R

ad

ian

t In

ten

sit

y

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Outline Dimensions

All Dimensions in mm

Operating Regime

We recommend to use Quasi Continuous Wave (QCW) mode with duty cycle 50% or 25% to obtain maximum average optical power and Pulse mode to obtain maximum peak power. Hard CW (continuous wave) mode is NOT recommended.

LED28-L TO-18, with glass cover

LED Basic Circuit Connection

Quasi Continuous Wave (QCW) mode Pulse Mode

LED anode is marked with a red dot on the rear side

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Precautions

Cautions:

Check your connection circuits before turning on the LED.

Mind the LED polarity: LED anode is marked with a RED dot. Reverse voltage applying is FORBIDDEN!

DO NOT connect the LED to the multimeter.

Control the current applied to the LED in order not to exceed the maximum allowable values.

Soldering:

Do avoid overheating of the LED

Do avoid electrostatic discharge (ESD)

Do avoid mechanical stress, shock, and vibration

Do only use non-corrosive flux

Do not apply current to the LED until it has cooled down to room temperature after soldering

Static Electricity:

LEDs are sensitive to electrostatic discharge (ESD). Precautions against ESD must be taken when handling

or operating these LEDs. Surge voltage or electrostatic discharge can result in complete failure of the device.

Operation:

Do only operate LEDs with a current source. Running these LEDs from a voltage source will result in complete failure of the device. Current of a LED is an exponential function of the voltage across it. Usage of current regulated drive circuits is mandatory.

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Revisions History

Rev. Rel. Date Chapter Modification Page

A1 2020-08-20 - Initial release -

© All Rights Reserved The above specifications are for reference purpose only and subjected to change without prior notice